Sickle grinder



April 1933. .1. BROWN ET AL 1,903,369

S ICKLE GRINDER Original Filed Deb. 31, 1950 gwoe'ntoz Patented Apr. 4,1933 UNITED STATES .mcx BROWN AND WILLIAM F. nnu'rnn, on o'ron; NEBRASKASICKLE GRINDER Application filed December 31, 1930, Serial No. 505,785,Renewed August 31 1332. 4

This invention relates to sickle grinders and its object is to provide asickle grinderhaving a stable support and having means for moving thesickle holding member laterally or toward and away from the grinder.

Another object of the invention is the provision of a hand operatedplatform for holding the sickle, the platform being slidable to bringvarious parts of the sickle into 1 contact with the grinder and beingalso pivotally movable toward 'or away 'from the grinder, there beingalso provided rests for holding the platform in position away from thegrinder. V V

Another object is the provision of a sickle platform which is pivotallyconnected to a handle with linkage 'for moving the sickle platformtoward and away from the grinder when the handle is raised or lowered.

Having in view these objects and others which will be pointed out in thefollowing description, we will now refer to the drawing, in which 1Figure 1 is a view in perspective of the sickle grinder showing thesickle holding members in their rest position with the sickle away fromthe grinder;

Figure 2' is a view in side elevation of a fragment of the sicklegrinder with the parts in the position shown in Figure 1.

Figure 3 is a view in side elevation of the sickle grinder with theparts in intermediate position between the operative grinding po- 5sition and the rest position.

The frameincludes rear legs and front legs .11 and 12 arranged ininverted V-shaped pairs having bearings 13 at their upper ends.'

The frame is braced by means of two transverse braces 14, a pair ofcrossed braces 15 and an additional brace 16. The bearings 13 receivethe shaft 17 which is provided with a grinder 18 and with a drivingpulley The rod 20 is secured at one of its extremities to'the leg 11 asshown in Figure 1. This rod 20 extends across the front ofthe frame andto a considerable distance beyond the opposite end of the frame. It isprovided with a pair of braces 21 extending to two rigid support for thefree end of the rod 20. Two collars 22 surround the rod 20 and they arefreely slidableon the rod. One of the collars has secured thereto a rod23 while the other collar has aisimilar rod 24 which terminates in ahandle portion." J ournalled to the rods 23'and 24 is atransverserod ortube 25.

The bent rod or tube 26 is pivotally sei cured'at the junction of therods 23 and 25 and it extends first upwardly and rearwardly and thenupwardly. The opposite end portion of the rod or tube 25 is benttoprovide an arm 27 which projects upwardly and rearwardly. The rod ortube 28 is secured, preferably by welding, to the arms 26 :and27.

The free end portion of the .bent rodi26 is formed into a clamp,thatportioncooperating with a clamping member 291 having a 28 is furtherprovided with an intermediate clamping member as shown in Figure 1, thepurpose ,of this construction beingkmore fully described in thedescription of the mode of operation of the sickle-grinder. The

of the legs, the purpose being to provide a sickle 81 may be clamped inall three clamps V as shown in Figure l or it may be clamped to theintermediate clamp and to one of the end clamps, 4 5' The grinderfurther includes a number of stops. The stops which function to maintainthe parts in the rest position include the stop 32 projecting upwardlyand forwardly from theyleg 12 and engaging they;

rod ortube 2 5 and the stop 33'projecting upwardly from the handlemember 24 for engaging the rod or tube 28/ The handle 24 is alsoprovided with a stop member 3 1 for engaging the rod or "tube '28 duringthe movement of the sickle holding platform into its operative position.a

From the foregoing description it is believed that the operation of thesickle grinder will be obvious. The inoperative position or the positionat rest is shown in Figures 1 and 2.. When the parts are in thisposition the tube 25 rests on the stop member 32 and the pipe or rod 28rests on the stop member 33. When it is desired to move the parts tooperative position the operator merely grasps the handle 24 and liftsits free end.

7 The movement following the lifting of the handle is a compoundmovement depending on the upper extremitv'of the stop member P 34. Whilethis movement is mainly the result of the action of the spring togetherwith the thrust from the parts 26 and 27, the shifting center of mass ofthe sickle carrying frame also affects the movement whereby thetransverse portion 28 is seated on the stop 7 member 34. As soon as thestop member 34 engages the member 28, continued upward movement of thefree end of the lever 24 has the effect of positively forcing the sicklecarrying frame forward toward the grinder.

1 During the grinding of the sickle the operator maintains his grasp onthe handle 24 in order to control the pressure of thesickle against thegrinder. The stop member 34 acts positively so that considerablepressure is possiblethrough the leverage of the lever 24. When thispressure is too great for the best results the operator merely appliesless leverage to thehandle and the spring 35 then makes. the regulationof the pressure extremely sensitive so that it is possible to maintaineven the very slightest pressure of the sickle against the grinder. Thespring 35 has the further advantage in acting as a bufferv to counteractthe vibration which might otherwise grind the sickles very unevenly. Bymaintaining only a slight pressure of the sickles on the grinder, thespring .35 ispermitted to compensate for the vibrations in pressure dueto the vibrations of the machine. At the same time the stop 34 willprevent the sickle holding frame from jumping entirely away from thesickle as the result of possible severe vibrations.

The sliding collars 22 make it possible to move-the sickle 31 to bringconsecutive teeth intocontact with the grinder 18. The three clampsprevent vibration inthe sickle itself This thrust is whereas two clampsalone have been found to cause excessive vibration in the sickle itself.The primary purpose of the three clamps, however, is to make it possibleto bring the end teeth of the sickle into contact with the grinder andat the same time to provide at least two clamps .for holding the sickle.The shifting of the sickle laterally is accomplished through thelever'24.

While we have described our lnvention in great detail, it is obviousthat numerous changes may be made without departing from the spirit ofour invention. We there fore reserve to ourselves therights to all Yimprovements and variations falling within the scope of the appendedclaims.

Having thus described our. invention in such full, clear, and exactterms that its construction and operation will be readily understood byothers skilled in the art to which it pertains, what we claim as new anddesire to secure by Letters Patent of the. United States is: l a

1. In a sickle grinder, a main frame 11wing a grinder shaftjournalledthereon, a sup ort on said main frame positioned inparallelism with said grinder shaft, a frame pivotally and slidablysecured to said support, a sickle carrying frame pivotally connected tosaid pivoted frame, said sickle carrying frame being provided withclamps forsecuring a sickle thereto, a handle projecting from saidpivoted frame, stops on said main frame and on said handle formaintaining said sickle carryingframe in inoperative position, and anadditional stop on said handle for engaging said sickle carrying framewhen raising said handle to operatively position said sickle carryingframe. i c

V 2.. In a sickle grinder, ajmain frame-having a grinder shaftjournalled thereon, a support on said main frame positioned inparallelism with saidgri-nder shaft, a frame pivotally and slidablysecured to said support, a sickle carrying frame pivotally connected tosaid pivoted frame, said sickle carrying frame being provided withclamps for securing a sickle thereto, a handle projectingfrom ioo saidpivoted frame, a pair of spaced stops P on said handle for engaging saidsickle car- 1 rying frame,fone of said stops being adapted to supportsaid sickle carrying frame in its inoperative position and the other ofsaid stops being-adapted to engage said sickle carrying said handle. p

3. In a sickle grinder, a main frame hav ing a grinder shaft journalledthereon, a supframeduring the'lifting movement of port on said mainframe positioned in paral:

lelism with said grinder shaft, a frame pivotally and slidably securedto said support, a sickle carrying frame pivotally connected to saidpivoted frame, said sickle carrying frame being provided withclamps forsecuring a sickle thereto, a handle projecting from said pivoted frame,and a pair of spaced and to said handle for facilitating the move mentof said sickle carrying frame from either of said stops to the other ofsaidstops.

In testimony whereof we afl'ix our signatures.

JACK BROWN. WILLIAM F. REUTER.

